dceffacb89
Add a helper method for collecting line table file references that does the correct thing for DWARF 5 vs DWARF 4 (in the latter case you have an implicit 0 entry which is the comp dir, whereas in the former case you do not). This is to avoid out-of-bounds errors when examining the file table section of a DWARF 5 compilation unit's line table. Included is a new linux/amd-only test that includes a precompiled C object file with a DWARF-5 section that triggers the bug in question. Fixes #2319
58 lines
1.2 KiB
Plaintext
58 lines
1.2 KiB
Plaintext
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Note:
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-----
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cfile-linux-amd64.syso was generated from the C source file that appears below.
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Build with Clang version 10:
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$ clang-10 -O -gdwarf-5 -c cfile.c -o cfile.syso
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The DWARF of interest is for the function "qtop". Triggering the bug
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requires that the source file in question appears as the first item
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in the DWARF line table file section, e.g.
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$ llvm-dwarfdump-10 --debug-line cfile.syso
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....
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standard_opcode_lengths[DW_LNS_set_epilogue_begin] = 0
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standard_opcode_lengths[DW_LNS_set_isa] = 1
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include_directories[ 0] = "/ssd2/go1/src/tmp/dlvbug"
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file_names[ 0]:
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name: "cfile.c"
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dir_index: 0
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md5_checksum: ...
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// ------------------------begin source code for cfile.c----------------
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#include <stdlib.h>
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#include <string.h>
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int glob = 99;
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inline int qleaf(int lx, int ly, int *lv)
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{
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lv[lx&3] += 3;
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return lv[ly&3];
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}
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int qmid(int mx, int my, int *lv, int *mv)
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{
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mv[mx&3] += qleaf(mx, my, lv);
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return mv[my&3];
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}
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int qtop(int mx, int my)
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{
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int mv[64], lv[66], n = (mx < 64 ? 64 : mx);
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memset(&mv[0], 9, sizeof(mv));
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memset(&lv[0], 11, sizeof(mv));
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return qmid(mx, my, lv, mv) + qleaf(mx, my, lv);
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}
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void Cfunc(int x) {
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glob += qtop(x, 43);
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}
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